definite melting point

例句：

1. 1.The temperature is definitely below zero.
   温度绝对是零度以下。
2. 2.He made a definite promise to help her.
   他明确地承诺要帮助她。
3. 3.The results are definite evidence of the experiment's success.
   结果无疑是实验成功的确凿证据。